Travelling crane with folding jib capture device and folding jib of such a crane

Abstract

The invention relates to a mobile crane comprising a lower vehicle with a running gear and an upper vehicle with a telescopic boom which is pivotable relative to the lower vehicle about a vertical axis, a boom head being arranged at the top end of the boom. The boom has a holder on one side for supporting a folding arm which can be fitted at the boom head in a releasable manner. The boom has a bracket laterally and a holding element arranged between the bracket and the boom head. When the folding arm is supported on the bracket, the folding arm can be pivoted about a vertical axis of the holding element to be fitted at the boom head. According to the invention, a first guard is arranged in the region of the bracket, by means of which a movement of the folding arm which is different from the pivoting movement about the vertical axis can be limited. Furthermore, the invention relates to a folding arm for a crane according to the invention.

Description

TECHNICAL FIELD

[0001] The invention relates to a travelable crane or mobile crane and to a folding boom for such a crane according to the preamble of claim 1. BACKGROUND

[0002] Travelable cranes or mobile cranes are generally designed for travel on public roads. In this field, special regulations apply with regard to the permissible weight and the maximum permissible dimensions, in particular height and width, of the mobile crane. Depending on its dimensions, different permissions are possible. The costs for the application and the obtaining of special permissions are also related to the dimensions.

[0003] In addition to the lower car and the upper car rotatably supported on the lower car, mobile cranes generally have a telescopic boom. Furthermore, it is common in some mobile cranes to equip a top boom, also referred to as a folding boom, on a boom head or roller head arranged at the end of the boom for use by the crane. Just in smaller mobile cranes, the folding boom is often supported at the side of the boom when traveling in public road traffic. Thereby, the mobile crane has a higher variability in its availability. It is known for this purpose that the folding boom is laterally supported at the boom by means of a plurality of holders, wherein a laterally protruding bracket can be provided on which the folding boom is supported during the support and / or during a part of the assembly process.

[0004] An important feature of a travelable crane with a folding boom supported at the boom and jointly guided is that the folding boom is moved from a transport position next to the boom into a working position in which the folding boom is equipped at the boom head and vice versa, also referred to as the equipment and de-equipment of the crane. A mobile crane of this type, which can travel to the place of use as a completely self-contained unit and can be prepared there for the entry into the working state, is also referred to as a taxi crane.

[0005] The preparation of the folding boom into the working position requires a plurality of movements, which can include not only linear movements but also movements about one or more pivot axes, which are usually vertical. However, for this movement, usually only limited crane actuators are available. Here, this can be a drive already present on the crane, for example a telescopic cylinder, or it can be a drive installed ad hoc, for example a hand-operated hydraulic machine.

[0006] The pivoting movement of the folding boom during the preparation process can also take place at a time at which, due to a maloperation, a reliable or complete connection to the telescoping jib is not established. Here, the folding boom, which is supported on the bracket, for example, by rollers / rollers, moves along the bracket during the pivoting movement. Here, if an operating command occurs, it can come about that the folding boom is supported on the end of the bracket, wherein the dead weight of the folding boom can cause further undesired movements and ultimately can cause the folding boom to slide off the bracket. In the worst case, there is a risk that the folding boom falls completely. SUMMARY

[0007] In this context, the object of the present application is to improve such a travelable crane in such a way that the safety during the equipping and de-equipping of the folding boom is increased.

[0008] According to the application, this object is achieved by a crane having the features of claim 1. Thus, a travelable crane or mobile crane is proposed, which comprises a lower vehicle having a running gear and an upper vehicle which is pivotable relative to the lower vehicle about a vertical axis and has a telescoping jib, at the top end of which a jib head is arranged. The jib has a holding element on one side for supporting a folding boom which can be detachably fitted at the jib head. The jib has a bracket laterally and a holding element arranged between the bracket and the jib head. The folding boom is pivotable about the vertical axis of the holding element to be fitted at the jib head, during which the folding boom is supported on the bracket.

[0009] By being supported on the bracket, the forces caused by the dead weight of the folding boom are distributed during the movement process of the equipping or de-equipping and the forces acting on the holding element are reduced. The running gear is a caterpillar running gear or a wheel running gear.

[0010] According to the application, a first guard is arranged in the region of the bracket, by means of which a movement of the folding boom different from the pivoting movement about the vertical axis can be limited.

[0011] Here, the expression "vertical axis of the holding element" means that the connection between the folding boom and the jib, which is made up of the holding element, allows a pivoting movement of the folding boom about the vertical axis. A movement of the folding boom different from the pivoting movement about the vertical axis is a movement which not only takes place mainly in a horizontal plane, but additionally has a vertical movement component. This occurs, in particular, in the event of a sliding or falling of the folding boom during an abnormal fitting process due to the dead weight of the folding boom.

[0012] Here, the equipping process of the folding arm is carried out with the boom horizontally oriented, such that the pivot axis about which the folding arm pivots is oriented vertically. However, the application also includes the case in which the assembly / disassembly of the folding arm is carried out with the boom placed obliquely, that is to say not completely horizontally oriented. In this case, the expressions "vertical axis" and "horizontal plane" are to be understood as meaning that the pivoting movement of the folding arm is carried out in a plane perpendicular to the pivot axis, which is oriented perpendicular to the longitudinal axis of the boom and lies in a plane parallel to the plane spanned by the longitudinal axis and a vertical line.

[0013] By means of the first guard, it is possible to prevent the folding arm from slipping off the support in the event of a mistake and thus to significantly increase the safety of the equipping and de-equipping process. The safety system according to the application therefore also covers the case in which the folding arm is pivoted about the vertical axis of the holding element such that the fastenings of the folding arm and of the boom head come together, but the fastenings which come together are forgotten to be connected or bolted and the connection of the folding arm at the holding element is subsequently released. In this case, the folding arm is not held at the boom head by the connection of the fastenings and the risk exists, as with other holding or guard devices, that the folding arm slips off the support and falls. By means of the additional guard in the region of the support, the falling of the folding arm in this case is effectively prevented.

[0014] Advantageous embodiments of the application result from the dependent claims and the following description.

[0015] In one embodiment, it is provided that a second guard is arranged laterally between the first guard and the boom head at the boom, by means of which second guard a vertical movement or a falling movement of the folding arm can be limited. By means of the combination of the first guard and the second guard, it is possible to reliably prevent the folding arm from falling even in the event of a serious mistake.

[0016] In another embodiment, it is provided that the second guard comprises a guard arm which projects from the boom, which guard arm is configured such that the folding arm does not come into contact with the guard arm in the transport position supported on the boom and when pivoted about the vertical axis. The guard arm can be arranged in the transport position either below the folding arm or project between the corner bar and the connecting strut of the folding arm without coming into contact with the folding arm. When the folding arm falls, it falls onto the guard arm such that the falling movement is stopped. Furthermore, the guard arm can have a projection projecting upwards on its end spaced apart from the boom, which projection prevents the folding arm from slipping sideways. Thus, by means of the projection, the horizontal movement of the folding arm can be blocked.

[0017] While the second safeguard itself has reduced the risk of the folding arm falling in case of a misoperation, it does not cover all conceivable error scenarios of the folding arm during the assembly and disassembly process. Thus, for example, in the scenario described above (in which the fastener to be connected at the meeting point is forgotten and the connection at the holding element is subsequently loosened) there is a risk that, despite the catching action of the second safeguard, the folding arm slips out of the safeguard and from the support. This case is effectively prevented by the first safeguard according to the application arranged in the rear region of the boom.

[0018] In another embodiment it is provided that the first safeguard is arranged at the support. That is, the first safeguard is connected with the support or is part of the support.

[0019] In another embodiment it is provided that the support is configured to be foldable and comprises at least two support parts which are pivotably connected with one another and releasably locked, wherein, for the assembly of the folding arm at the boom head, the support can be brought by unfolding from a transport state into an assembly state and vice versa for disassembly. When the folding arm is pivoted about the holding element, the folding arm passes over a relatively long distance on the support due to the lever ratio, so that the support needs to be configured relatively long during assembly. The foldable embodiment of the support enables the crane to be space-savingly driven and to support the folding arm, since the folding arm in the transport position is only supported on the parts of the support near the boom. The support can be composed of two, three or a larger number of parts which are respectively pivotably connected with one another and releasably locked.

[0020] In another embodiment it is provided that the support is configured such that the folding arm in the transport position supported at the boom is supported on a first support part which is preferably fixedly connected with the boom by at least one roller and the folding arm, when pivoted about the vertical axis of the holding element and when the support is unfolded into the assembly state, rolls along the upper side of the support by the at least one roller.

[0021] In another embodiment it is provided that the first protection device is arranged at a pivotable part of the support, which in the assembled state constitutes an end part of the support, and that the first protection device is configured such that the folding arm does not come into contact with the first protection device in the transport position supported at the boom and when pivoted about a vertical axis. That is, if a normal assembly process is carried out (in which the folding arm carries out a pivoting movement about a vertical axis, that is to say, a movement within a substantially horizontal plane), the folding arm does not come into contact with the first protection device. In the case of an additional vertical movement component, in particular when the folding arm is about to slide off the support, the first protection device is contacted, so that a fall is prevented.

[0022] Preferably, the upper side of the support facing the folding arm is bevelled downwards in the region of the first protection device. This can be required, for example, because the parts of the outer side of the support must be pivotable if the folding arm is supported in the transport position on the inner side or first part of the support and in particular on an immovable part. If the folding arm is not held on a pure movement trajectory about a vertical axis by appropriate fastening, a support, for example a roller, can reach this bevelled section and can cause an acceleration and a slide of the folding arm. The first protection device can advantageously be installed such that the downward rolling of the folding arm along this bevelled surface is taken into account, that is to say, such that the first protection device is contacted by the folding arm only in this case.

[0023] In another embodiment it is provided that the first protection device comprises a catch element, in particular of a bar or rod shape, which is configured such that, in a movement different from a pivoting movement about a vertical axis or when the folding arm slides off the support, a catch hook provided at the folding arm engages with the catch element and blocks the folding arm from continuing to move. Preferably, the catch hook is configured such that the connection to the catch element is prevented from coming loose. Furthermore, the catch hook is arranged such that it does not come into contact with the catch element in the normal assembly process. The catch hook can be welded together with the folding arm, in particular a corner bar or a connecting support, or fastened in another way, for example by means of a bolt, a clip or the like.

[0024] In another embodiment it is provided that the catching elements project on both sides from the holder, wherein two catching hooks are provided at the folding arm, which are arranged such that, when the folding arm slides off the holder, the catching hooks engage on both sides of the holder with the catching elements. This symmetrical solution is more stable and can compensate, if necessary, a tilted state of the folding arm when it slides off the holder, so that at least one of the two catching hooks engages in each case with a respective catching element. Here, the catching elements can be manufactured as one piece (for example as a single rod element which projects on both sides beyond the holder) or as multiple pieces (for example as two separate rod elements which are mounted at both sides of the holder).

[0025] In an alternative embodiment it is provided that the opposite is the case, i.e. the first safeguard comprises at least one catching hook which is configured such that, upon a movement other than a pivoting movement about a vertical axis or when the folding arm slides off the holder, a catching element arranged at the folding arm and in particular rod-shaped engages with the catching hook and blocks a further movement of the folding arm. Here, too, a plurality of catching hooks can be provided, for example in a symmetrical arrangement with respect to the holder.

[0026] In another embodiment it is provided that the catching elements are formed by the corner rods or connecting struts of the folding arm. Thereby, the folding arm does not have to be equipped with additional components, which saves costs and weight.

[0027] Likewise, a combination of the two above-mentioned embodiments can be envisaged, such that the first safeguard not only has catching elements but also catching hooks, which together with the respective catching hooks and the respective catching elements of the folding arm or engage with the respective catching hooks and the respective catching elements of the folding arm when the folding arm slides off the holder.

[0028] In another embodiment it is provided that the boom head has fastening elements for connecting with respective fastening elements of the folding arm, wherein at least one fastening element of the folding arm can be brought together with a fastening element of the boom head by pivoting of the folding arm about a vertical axis of the holding element, wherein, preferably after connecting the fastening elements brought together and loosening the connection to the holding element, the folding arm can be pivoted about a vertical axis of the connected fastening elements brought together and thereby the remaining fastening elements can be brought together. The fastening elements can be peg points or fork elements which can be reversibly connected to each other by pegging. Here, the pegging each forms a vertical axis about which the folding arm can be pivoted.

[0029] Furthermore, the present invention relates to a folding boom for a crane according to the invention. Here, the same advantages and features as those for the crane according to the invention are obviously obtained, and therefore will not be repeated here. Thus, the above-described embodiments of feasible designs for folding booms related to cranes according to the invention are correspondingly applicable to folding booms.

[0030] In particular, the folding arm according to the invention may have at least one roller / roller by which the folding arm is mounted on the support and rolls on the support by the roller / roller during pivoting about the vertical axis of the retaining element, as described above. Furthermore, as described above, the folding arm preferably has a capturing hook or capturing element that engages with a corresponding capturing element or capturing hook in a region of the support when the folding arm slips off the support in a manner different from its pivoting movement about the vertical axis, thereby preventing further movement of the folding arm. Additionally, the folding arm may have multiple components that are tiltable or pivotable relative to each other, such that the front components of the assembled folding arm can be tilted, for example, by means of an adjusting cylinder.

[0031] Furthermore, the present invention relates to a crane according to the present invention combined with the folding arm described above according to the present invention. Attached Figure Description

[0032] Other features, details, and advantages of the invention will become apparent from the embodiments described below with reference to the accompanying drawings. In the drawings:

[0033] Figure 1 An embodiment of the crane according to the invention is shown in a side view, wherein the folding boom is in the transport position;

[0034] Figure 2 It shows that according to Figure 1 A top view of the crane's boom and folding arm;

[0035] Figure 3 It shows that according to Figure 2 A schematic diagram of the view;

[0036] Figure 4 A schematic cross-sectional view is shown penetrating the folding boom and the boom perpendicular to the longitudinal axis in the area of ​​the second protective device;

[0037] Figure 5 A schematic cross-sectional view is shown penetrating the folding boom and the boom perpendicular to the longitudinal axis in the area of ​​the first protective device;

[0038] Figure 6 A portion of the folding boom supported on the crane arm is shown in a perspective view of the support structure in its transport state.

[0039] Figure 7 A stent according to Figure 6 is shown in a perspective view from below;

[0040] Figure 8 A detail of a folded arm rolling over a stent in an unfolded state is shown in a perspective view;

[0041] Figure 9 A detail of a capture hook surrounding a capture element after a folded arm has slipped off a stent is shown in a perspective view;

[0042] Figure 10 A stent according to Figure 9 is shown with a capture hook according to a further embodiment; and

[0043] Figure 11 A detail of a capture hook and a capture element according to an alternative embodiment after a folded arm has slipped off a stent is shown in a perspective view. DETAILED DESCRIPTION

[0044] An embodiment of a travelable crane 10 according to the application is shown in a side view in Figure 1 . The crane 10 has a lower car 12 with a wheel travel mechanism with four axles, an upper car 14 rotatably supported on the lower car 12 about a vertical axis, and a telescoping jib 16 pivotably arranged on the upper car 14 about a horizontal axis. A roller head or jib head 18 is located at the end of the jib 16, the roller head or jib head 18 having a plurality of fasteners 50 configured as bolted points, at which a folded arm 20 can be assembled at the jib 16 as required. Figure 2 and Figure 3 Each is shown in a top view with the jib 16 and the folded arm 20 Figure 3 is shown in a schematic view.

[0045] The embodiment is a so-called taxi crane 10, since the folded arm 20 can be driven to the site of use together with the crane 10 and can be assembled and disassembled on site without any other external aids. To this end, the folded arm 20 can be supported and fixed laterally at the jib 16 in a transport position, as shown in Figure 1 . To this end, the jib 16 has a row of holders laterally. To be assembled at the jib head 18, the folded arm 20 likewise has a plurality of fasteners 60 configured as bolted points. At this point, the folded arm 20 is supported in the transport position such that the wider end is positioned next to the jib head 18 by the fasteners 60.

[0046] The boom 16 has a holding element 24 laterally, by which the folding arm 20 is pivotably supported at the boom 16 about a vertical axis, wherein the folding arm 20 is secured against an undesired pivoting in the transport position by an additional, not shown in detail here, holding piece. Furthermore, a bracket 22 is arranged laterally on the boom 16 more rearwardly (in the direction of the support at the upper car 14), on which the folding arm 20 is supported by means of a plurality of rollers or rollers 26. A guard arm 34 is located in the region of the holding element 24, which has a protrusion 36 projecting upwardly arranged at an end spaced apart from the boom 16, which is arranged and configured such that it does not come into contact with the folding arm 20 in the transport position and when normal assembly or disassembly.

[0047] Figure 4 and Figure 5 A portion of the boom 16 and a schematic sectional view of the folding arm 20 perpendicular to the longitudinal axis of the folding arm 20 or the boom 16 is shown in the region of the guard arm 34 Figure 4 ) and the bracket 22 Figure 5 ). Here, only the boom 16 is shown schematically. As can be seen in Figure 4 , the guard arm 34 is arranged at a height at which it passes below the upper corner bar of the folding arm 20 and above the lower corner bar of the folding arm 20. Thus, no contact occurs when the folding arm 20 is moved laterally. The guard arm 34 serves as a catch device which should prevent the folding arm 20 from falling in the event of a false operation. If the folding arm 20 falls from the boom 16, it is caught by the guard arm 34, wherein the protrusion 36 prevents the folding arm 20 from sliding laterally out of the guard arm 34.

[0048] When assembling the folding arm 20, a pivoting about the vertical axis formed by the holding element 24 is first carried out, for example by means of a hydraulic cylinder, in order to bring the fastening pieces 50, 60 of the boom head 18 and the folding arm 20 together and to overlap in a horizontal movement path. Subsequently, the fastening pieces are bolted such that from this point on the folding arm 20 is reliably fastened at the boom 16 and it is no longer possible for the folding arm 20 to fall down. Now the connection at the holding element 24 can be released. In a next step, a horizontal pivoting movement of the folding arm 20 about the vertical axis formed by the bolting of the fastening pieces 50, 60 is carried out until the longitudinal axis of the folding arm 20 and the boom 16 are aligned and thus lie in the same plane or in parallel planes and the remaining fastening pieces 50, 60 come together. Finally, this remaining fastening is also bolted. When disassembling, the above steps are carried out in reverse order.

[0049] During the pivoting movement of the folding arm 20 about the holding element 24, the outer end of the folding arm 20 (in Figure 2The end on the left-hand side is moved away from the boom 16. Here, the folding arm is guided on the support 22. In order to reduce the forces, rollers 26 are provided. Due to the lever ratio, the area required for supporting the folding arm 20 when it is pivoted is relatively long. For this reason, the support 22 is embodied foldable and comprises three support parts 22', 22", 22"' which are pivotably connected to one another and can be locked to one another, respectively.

[0050] In the transport position of the folding arm 20, the support 22 is folded up in the transport state in order to reduce the space requirement of the boom 16. The folding arm 20 is supported here on the first support part 22' which is directly fixed at the boom 16. When the folding arm 20 is assembled, the support 22 is unfolded, in contrast, so that the support parts 22', 22", 22"' are oriented linearly and locked. Thereby, when pivoted laterally, the folding arm 20 can roll on the upper surface of the unfolded support 22 by means of the rollers 26. In the transport position, the folding arm 20 is supported on the first support part 22' which is directly fixed at the boom 16. Figure 3 In the middle, the support 22 in the unfolded state (assembled state) is shown schematically.

[0051] While the protective arm 34 has already provided a certain protection against the folding arm 20 falling due to incorrect handling, severe handling errors are not always sufficiently covered. For example, the case that the fastening elements 50, 60 which come together after pivoting about the holder 24 are forgotten to be bolted and subsequently the connection at the holder 24 is released can result in the folding arm 20 falling onto the protective arm 34 and then sliding off the support 22. In this movement, it can occur that, due to the inclined state of the folding arm 20 (caused by the self-weight of the folding arm and the two support parts 22, 34), the folding arm 20 slides over the protrusion 36 and then falls down.

[0052] In order to also cover the case of the folding arm 20 sliding down and to ensure a reliable assembly process even in the case of severe handling errors, according to the application a further catching or protective device 30 is provided in the region of the support 22. In the following, the device according to the application in the rear region of the boom 16 is referred to as the first protective device 30 and the protective arm 34 together with the protrusion 36 in the front region of the boom 16 is referred to as the second protective device 32.

[0053] In Figures 6 to 9 A first embodiment of the first protective device 30 according to the application is shown in detail in Figure 6 and Figure 7The image shows the bracket 22 in its folded or transported state. In the transported state, two pivotable bracket components 22" and 22"' rest against the first bracket component 22'. In the transported position, the folding arm 20 is positioned next to the boom 16 and supported on the first bracket component 22' by rollers 26. The outermost bracket component 22"' has a slope or downward cut towards its end. This is especially true because the outer bracket components 22" and 22"' need to be freely pivotable when the folding arm 20 is supported on the first bracket component 22' by its rollers 26. The slope of the bracket in its final region is actually due to the disassembly process. During disassembly, the operator pivots the folding arm to the side of the boom 16. Here, the folding arm is held only on two bolts around the pivot axis. The large extension length creates a large lever arm that deflects the folding arm downward. Thus, at the end of the pivoting movement, the folding arm must be supported by the rollers 26, and thus, in its transported position, is lifted next to the boom.

[0054] A support element in the form of a rod-shaped capture element 40 is arranged at the outermost support component 22"', the capture element extending laterally (perpendicular to the longitudinal axis of the support component 22"' in this embodiment) from the support component 22"'. Figure 8 The outermost bracket component 22"' is shown in its unfolded state (i.e., bracket 22 is in its assembled state). As the folding arm 20 swings out, the roller 26 rolls on the unfolded bracket 22. During normal assembly, the folding arm 20 moves in a horizontal plane while pivoting about a vertical axis (for the retaining element 24 or the fasteners 50, 60). If an operational error occurs (the folding arm 20 slides downwards during the error, i.e., the movement of the folding arm 20 has a vertical component during the error), the first protective device 30 ensures that the undesired movement is stopped or blocked.

[0055] Therefore, a capture element in the form of a hook, or more precisely, a capture hook 42, is provided at the folding arm 20. Figures 6 to 9 In the embodiment shown, the hook, or more precisely the capture hook 42, is welded to the corner bar of the folding arm 20; conversely, in Figure 10 In the embodiment shown, the hook, or more precisely the capturing hook 42, is clamped onto the corner bar by means of a clamp 44. If the roller 26 of the folding arm 20 disengages from the bracket 22 (which can...), Figure 8The folding arm 20 rolls down the inclined surface of the outermost support part 22 " and accelerates due to gravity. After leaving the support 22, the support effect is completely lost. However, the movement of the folding arm 20 so far is maintained, so that a combined movement with vertical and horizontal movement components is obtained. Therefore, the positions of the catching hooks 42 and the catching element 40 are suitably chosen so that the catching hooks 42 of the folding arm 20, which are caught in the fall, enclose the catching element 40 and, as a result, the folding arm 20 is "caught" (see Figures 9 to 10 ). However, during normal assembly or disassembly, the catching hooks 42 do not touch the catching element 40.

[0056] The profile / shape of the catching hooks 42 is designed so that the connection to the catching element 40 cannot be released by itself. Alternatively, the connection between the catching element 40 and the catching hooks 42 is designed so that energy can be dissipated. This can be achieved by plastic deformation of the catching element 40 and / or the catching hooks 42 or also by friction. A certain elasticity of the components is also conceivable.

[0057] Contrary to the illustrated figures, a symmetrical solution is also conceivable. Thus, a longer catching element 40 is used, which extends on both sides of the outermost support part 22 " and two or more catching hooks 42 are used on both sides of the support 22. It is also conceivable that a longer catching element 40 is configured on one side and several catching hooks 42 are used on one side of the support 22. Thereby, different states / inclinations of the folding arm 20 when falling can be taken into account and a reliable catching is guaranteed.

[0058] Figure 11 An alternative embodiment is shown, in which a catching hook 42' consisting of two parallel plates is arranged at the end of the support 22 or as an extension of the outermost support part 22 " and a catching element 40' is arranged at the folding arm 20. This can be achieved, for example, in that one of the corner bars of the folding arm 20 (as shown in Figure 11 ) forms the catching element 40' and is caught and held by the catching hook 42' when falling. It is obvious that a separate catching element 40' can also be provided at the folding arm 20. The position and shape of the catching hook 42' can also differ from the embodiment shown in Figure 11 .

[0059] List of reference signs

[0060] 10 crane that can be moved

[0061] 12 lower car

[0062] 14 upper car

[0063] 16 jib

[0064] 18 jib head

[0065] 20 folding arm

[0066] 22 bracket

[0067] 22 'bracket component

[0068] 22 "bracket component

[0069] 22 " 'bracket component

[0070] 24 retaining element

[0071] 26 roller

[0072] 30 first guard

[0073] 32 second guard

[0074] 34 guard arm

[0075] 36 protrusion

[0076] 40 capture element

[0077] 40 'capture element (corner bar)

[0078] 42 capture hook

[0079] 42 'capture hook

[0080] 44 clip

[0081] 50 fastener of the jib head

[0082] 60 fastener of the folding arm

Claims

1. A travelling crane (10) comprising a lower car (12) having a running gear and an upper car (14) having a telescopic jib (16) which is pivotable about a vertical axis relative to the lower car (12), a jib head (18) being arranged at the top end of the jib, wherein The telescopic boom (16) has a holding element on one side for supporting a folding arm (20) which can be fitted at the boom head (18) in a releasable manner, wherein the telescopic boom (16) has a bracket (22) laterally and the holding element (24) is arranged between the bracket (22) and the boom head (18), and wherein, when the folding arm (20) is supported on the bracket (22), the folding arm (20) can be pivoted about a vertical axis of the holding element (24) to be fitted at the boom head (18), characterized in that a first guard (30) is arranged in the region of the bracket (22), by means of which a movement of the folding arm (20) different from the pivoting movement about the vertical axis can be limited; a second guard (32) is arranged laterally at the telescopic boom (16) between the first guard (30) and the boom head (18), by means of which a vertical movement of the folding arm (20) can be limited; and the second guard (32) comprises a guard arm (34) which projects from the telescopic boom (16), the guard arm being configured such that the folding arm (20) does not come into contact with the guard arm (34) in the transport position supported at the telescopic boom (16) and when pivoted about the vertical axis.

2. The crane (10) according to claim 1, characterized in that The first guard (30) is arranged on the bracket (22).

3. The crane (10) according to claim 1, characterized in that The bracket (22) is configured to be foldable and comprises at least two bracket parts (22', 22'', 22''') which are connected to one another in a pivotable manner and are locked in a releasable manner, wherein, in order to fit the folding arm (20) at the boom head (18), the bracket (22) can be brought from the transport position into a fitted state by unfolding, and vice versa.

4. The crane (10) according to claim 3, characterized in that The bracket (22) is configured such that the folding arm (20) is supported on a first bracket part (22') by at least one roller (26) in the transport position supported at the telescopic boom (16) and such that the folding arm (20) rolls along the upper side of the bracket (22) by the at least one roller (26) when pivoted about the vertical axis of the holding element (24) and when the bracket (22) is unfolded into the fitted state.

5. The crane (10) according to claim 4, characterized in that The first guard (30) is arranged at a pivotable part (22''') of the bracket (22) which constitutes an end part of the bracket (22) in the fitted state, and the first guard is configured such that the folding arm (20) does not come into contact with the first guard in the transport position supported at the telescopic boom (16) and when pivoted about the vertical axis, wherein the upper side of the bracket (22) faces the folding arm (20).

6. The crane (10) according to claim 3, characterized in that The first guard device (30) comprises a rod-shaped catching element (40) which is configured in such a way that, when the folding arm (20) slides off the holder (22) with a pivoting movement about a vertical axis, a catching hook (42) arranged at the folding arm (20) engages with the catching element (40) and blocks the folding arm (20) from continuing to move.

7. The crane (10) according to claim 6, characterized in that The catching element (40) projects on both sides from the holder (22), wherein two catching hooks (42) are arranged at the folding arm (20) in such a way that the two catching hooks (42) engage with the catching element (40) on both sides of the holder (22) when the folding arm (20) slides off the holder (22), wherein the catching element (40) can be produced in one piece or in multiple pieces.

8. The crane (10) according to claim 3, characterized in that The first guard device (30) comprises at least one catching hook (42') which is configured in such a way that, when the folding arm (20) slides off the holder (22) with a pivoting movement about a vertical axis, a catching element (40') is arranged at the folding arm (20).

9. The crane (10) according to claim 8, characterized in that The catching element (40') is formed by a corner bar or a connecting strut of the folding arm (20).

10. The crane (10) according to claim 1, characterized in that The boom head (18) has fasteners (50) for connecting with corresponding fasteners (60) of the folding arm (20), wherein at least one fastener (60) of the folding arm can be brought together with a fastener (50) of the boom head by pivoting of the folding arm (20) about a vertical axis of the holding element (24), wherein, after connecting the fasteners (50, 60) brought together and releasing the connection to the holding element (24), the folding arm (20) can be pivoted about the vertical axis of the fasteners (50, 60) brought together and connected, and, as a result, the remaining fasteners (50, 60) can be brought together.

11. The crane (10) according to claim 1, characterized in that The folding arm has at least one roller (26) by which the folding arm rests on the holder (22) and rolls on the holder (22) during pivoting about the vertical axis of the holding element (24), wherein the folding arm (20) has a catching hook (42') or a catching element (40) which engages with a corresponding catching element (40') or catching hook (42) in the region of the holder (22) when the folding arm (20) slides off the holder (22) with a pivoting movement about a vertical axis, so that the folding arm (20) is blocked from continuing to move.

12. The crane (10) according to claim 1, characterized in that The guard arm (34) has a protrusion (36) projecting upwards at the end.

13. The crane (10) according to claim 4, characterized in that The first holder part (22') is fixedly connected to the telescoping boom (16).

14. The crane (10) according to claim 5, characterized in that The upper side of the holder (22) is bevelled downwards in the region of the first guard device (30). The first guard device (30) comprises a rod-shaped catching element (40) which is configured in such a way that, when the folding arm (20) slides off the holder (22) with a pivoting movement about a vertical axis, a catching hook (42) arranged at the folding arm (20) engages with the catching element (40) and blocks the folding arm (20) from continuing to move.

15. The crane (10) according to claim 8, characterized in that The capture element (40') is a bar-shaped capture element (40') and the capture element (40') engages with the capture hook (42') and blocks the folding arm (20) from continuing the movement.

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